Ferroli furnace shows F43; unit may not start or may shut down quickly.

This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.

If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.

Possible Causes

Disconnected Ferroli NTC sensor, Broken sensor lead, Faulty connector at PCB

Safety: Isolate power before working on wiring.

Steps:

Check sensor plug: Ensure the NTC plug is fully inserted into the PCB socket.
Inspect cable: Look for breaks or damage along the cable route.
Reset: Restore power and reset the unit after reseating connectors.

Professional help: If F43 persists, the sensor or PCB input must be tested and replaced by a technician.

Medium 3/5

Relevant NTC Temperature Sensor

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